The tall centre ridge looks like it may accidentally get shifted (caught on clothing, etc.) I believe the wide (triangle shape) one is designed for guys who want to run a pistol grip.Either with the tall center ridge, or the wide button shaped one.
I also had an 18.5" 590A1 but sold is a few years ago…(regretted it), a 590A1 20" BlackWater(just sold it) and a 590 14" (all factory) which I really wanted to keep but a G'Nutter tracked me down and offered me top dollar... I couldn't refuse.
Here's an old pic
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